A 23-year-old South San Francisco man was sentenced Friday to a year in jail and five years probation for the drunken crash that killed his cousin and injured another after spending an afternoon drinking tequila shots at his father’s home.

Prosecutors argued for Dennis Rogelio Salguero to receive seven years and eight months in prison but his family — which is the same family as the victim — asked the court for probation. The Probation Department also recommended probation in a pre-sentencing report.

Salguero’s jail term is modifiable to a treatment program.

Prosecutors say Salguero spent the afternoon of Dec. 18, 2013, drinking tequila at his father’s Daly City home before leaving with his two cousins against the advice of his father and uncle. Just before 5 p.m., his vehicle swerved across Interstate 280 into the center divider near the North Westlake Avenue off-ramp.

One cousin in the rear was ejected and died while a cousin in the front passenger seat was injured.

Salguero’s blood alcohol level was .14 and .13 two hours after his arrest, according to the District Attorney’s Office.

In April, Salguero pleaded no contest to felony vehicular manslaughter while driving under the influence and felony DUI causing injury.

Salguero had been in custody on $250,000 bail but waived his credits as part of sentencing.